Abstract
Troponin I is the subunit of the troponin complex in striated muscle which inhibits actomyosin ATPase activity. We have isolated a full-length cDNA clone for rat cardiac troponin I and determined its nucleic acid sequence. The amino acid sequence deduced from this clone shows 88%–92% similarity with previously reported amino acid sequences for rabbit (Wilkinson and Grand, 1978) and bovine (Leszyk et al.) cardiac troponin I. Examination of cardiac troponin I mRNA abundance during development revealed a 15-fold induction in its expression in the adult heart compared to that in embryonic (14 day) heart muscle. Furthermore, expression of cardiac troponin I mRNA was restricted to heart muscle and was not detected in skeletal muscle at any developmental stage.
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